We have had a few questions about this, so we have decided to make a sticky of our spoiler policy until the FAQ can be updated.

For spoilers, anything up until two weeks after the studio release needs to be hidden behind a spoiler tag. This includes everything - books, movies, television shows, comics. Any officially released spoilers that are given must also be tagged as spoilers until the two weeks after the official release of the movie/book/television show in question, not two weeks after the spoiler's release.

Spoilers constitute as anything and everything that may regard to the release in question - content, writing, directors, actor appearances, etc.

Even after a spoiler no longer has to be tagged, it Is still considered common courtesy - though not required - to warn others in your title bar or the beginning of a story thread about spoiler content. That way, anyone who wishes to remain unspoiled will stay so.